title: Description and scanning electron microscopic observation of a new species of the genus Polycopetta (Crustacea, Ostracoda, Cladocopina) from an interstitial habitat in Japan.
abstract: A new species of the genus Polycopetta Chavtur, 1981, Polycopetta quadrispinata sp. n. is described from the interstitial environment of Mihomasaki Beach in Japan. These observations showed some morphological peculiarities of Polycopetta quadrispinata sp. n. compared with its congeners; Polycopetta monneroni Chavtur, 1979, Polycopetta curva Chavtur, 1979, Polycopetta bransfieldensis (Hartmann, 1987), and Polycopetta pax Kornicker and Harrison-Nelson, 2005. Three characteristics are described for the first time: (1) a seta with serrated tip on the male antennula, (2) the endopodite of the fifth limb consisting of two podomeres, (3) the long spermatozoa in the male posterior body. More detailed observations of the type species are needed in order to update the generic diagnosis.
authors.affiliation: Institute of Geoscience, Faculty of Science, Shizuoka University, Oya 836, Suruga-ku, Shizuoka City, Shizuoka Prefecture, 422-8529, Japan.
authors.forename: Hayato
authors.initials: H
authors.lastname: Tanaka
authors.forename: Akira
authors.initials: A
authors.lastname: Tsukagoshi
keywords: Endopodite of fifth limb; Polycopetta; long spermatozoa; male antennula; pore systems